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unmarriedcertificateformatforindianarmypdfdownload.The present invention relates to a rubber composition for use in a tire tread, and more particularly to a rubber composition for use in a tire tread having improved compatibility with carbon black and excellent rolling resistance.
Heretofore, there have been known a variety of rubbers for use in tire treads, including natural rubbers, synthetic rubbers, and the like. In recent years, natural rubbers have been predominantly used.
The advantages and disadvantages of the above-mentioned rubbers for tire treads can be summarized as follows.
Specifically, the natural rubber has excellent low-temperature performance. However, it has a serious drawback of being inferior in abrasion resistance and traction performance.
The synthetic rubbers, such as chloroprene rubber, acrylonitrile-butadiene rubber, and the like, have good traction performance and abrasion resistance, but they are inferior in low-temperature performance.
Tread rubbers for tires which have recently been employed and have been developed so as to improve the above-mentioned shortcomings of the conventional rubber compositions have been proposed, and they include blends of a natural rubber and a synthetic rubber with a glass fiber and a carbon black. In these compositions, the low-temperature performance has been improved by increasing the amount of the carbon black. However, the blend with a large amount of carbon black has been found to be insufficient in rolling resistance.
The present inventors have found that the compatibility between the carbon black and the rubber is greatly affected by the specific surface area, and their experiments have shown that the compatibility is greatly affected by the specific surface area. The compatibility between the carbon black and the rubber can be enhanced by increasing the specific surface area. However, when the specific surface area is too large, the rubber is apt to deteriorate in the process of rolling.Cognitive Theory
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